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(a. s. MELCHER PRESSURE REGULATOR til-1 1ml Filed 060. e; 1919 2 Sheets-Sheet 1 w-win Mun I Inventoro itorneys.

a. s. MELCHER PRESSURE REGULATOR Dec, 1924.

Original Fneanec. e. 1919 2 Sheets-Sheet 2 SUPPLY )Jn wen-tar.-

.732, c/Qtf'om eys I ll Reiauecl Dec. 16, 1924.

m sums PATE- NT mm.

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thereby d {nmkge same way, M'hevertbare is any vanatlon 1 n sham zpmasmze, 1110 MM r arr pressgm as net maintained :to w 1100 u mammum ficiency. The "thrice wphqdyrng tbs eM-inventign is automtm 111 its opambwn a isrmngmlmq flmfiir iorrexnhmg oondxtmns and to previqlent operationlofihe devieeunder sudden charges of ,prassme, whiph devics is, never- Plmle s fi hcate and qumkly mspmnsive in 18% action and rpmmuhr'ly capable 0i .nse under veny low pressures.

ilhmin entiml will fully mrderstood by mi r pee -t the id om mg de mptmn when taken ,m .eonnectmn with ithe aneompanying drammgs, and the novel :featumsfihareo all ,he ,po'mted out and clearly defined in the hclaims at olasg of this speoifieatirm.

fin file d-zpmngs, -F-1 ,-1.is a side elevatm, partly m.-section oa .devioerembodying the gmvqlgtion.

Egg. B is iajtqp' plan view .of the device shawnqin Fig. 1.

Fig. 3 is-a :section taken on .line 3--3 0f '1- iig. '4 is -a seation .taken an the line 4.4 of Egg. 2.

Fig. :5 is-a section taken on the line 5-4) Qf E1 Beiirrmg mm to ,the drawings and particularly tol, thare is ShQWIl at A a drgsit pmducing device, as ior instgnoe, a 1019mm. At B 1s :shawp a motor for operafi said.dmfi\p edumg dwice the mater in t was: hemg an alaotnic motor, .and at C is show-n za mator contnollingolement, in this qagera rheastat. These parts are shown fqrJlmpurpose-of .one method of appliegytion afm y devise and it will be andersboad that the inwentian is 'notxlimited to the particular qelemqnt show-n, since it will be ebwimls that the device is equally applicable \to other ionms ocf mntor 'elements and draft producing dev-iaes.

At ill is shown .a. body having a diaphragm chamber 12 which is arranged to be cmmaated with the boiler pressure by an inlat pipe 13. The body 11 is also with a diaphragm chamber 14 having an .epening 15 for -o0-nne0ti0n with the air which draft, the whole being mounted on a suitable supporting bracket 16. H

Within the boiler pressure diaphragm chamber 12 is a diaphragm 17 of any usual form which forms the upper wall of the chamber 12so that it is subjected on one side to pressure therein. The upper face of the diaphra 17 has the usual button and knife e ge member 18, the latter of which engages with a lever 19 mounted in the upper portion of the body 11. The inner end of the lever 19 has a pair of studs 20 (only one of which is shown in Figure 1), each of which engage with fixed straps 21 between which the end of the lever 19 is received. The lever 19 extends through one of several openings 22 in the body 11 in a substantially horizontal position, the lever being provided with the usual Weights 23 and 25. The diaphragm 17 is open to atmospheric pressure on the upper side, the weighted lever 19 being arranged to yieldingly resist the boiler pressure to which the lower surface of the diaphragm is subjected and to take part in the control of the draft mechanism. The diaphragm 17 constitutes the boiler pressure sensitive element.

A cylinder 24 is mounted on the body 11 and contains a piston 25 which is controlled by a pilot valve 26 and may be actuated by any medium, such as water under pressure from some suitable source, as for instance, the ordinary municipal water supply system. Secured to the piston 25 is a stem 27 rejects through a suitable stufling box 28 111 one end of the cylinder 24 and is adapted to be connected with the throttle of a fan engine, a motor or other draft producing device anda damper if desired.

The pilot valve 26 may be of any common form and is provided with a valve member 29 having a stem 30 which controls suitable passages to the ends of the cylinder 24, whereby fluid entering the pipe 31 is permitted to pass to the lower end of the cylinder 24 when the valve member 29 is moved up to cause the piston 25-to move u and to introduce fluid to the other end of e cylinder 24 when the valve member 29 is moved down to cause the piston 25 to be moveddown. In the position shown in the drawings, the valve member 29 is in neutral position so that fluid is not permitted to enter the cylinder 24, and the piston 25 remains stationary. In the device as shown, the piston is moved down to open the throttle of the draft mechanism and is moved up to close it. It will be understood, however, that the invention is not limited to this construction, for any motor for controlling the throttle of the draft mechanism may be used.

The stem 30 of the valve member 29 is pivotally secured to a floating link 32, one end of which is pivotally connected to the arm 33 and the other end of which is pivconnected to a rod 36 which is in turn members 53 and 54, respectively.

ota-lly connected to the upper end of a rod 34. The lower end of the rod 34 is pivoted to a floating link 35 at a point intermediate its ends, one end of which link is pivotally PIV- otally connected with the lever 19. The other end of the floating link 35 is pivotally connected to a rod 37 pivotally mounted on a lever 38, which, together with the lever 19, operates the valve member 29 in a manner hereinafter to be described.

The regulator hereinabove described is provided with a compensating mechanism, preferably of the type shown in the drawings. The compensating mechanism consists of the arm 33, referred to above, which is mounted on a shaft 39 journalled in a bracket 40 and carrying at its other end an arm 41. The arm 41 is connected with a rod 42 mounted in a guide 43 and having a head 420 which is held against a cam 44 by a suitable sprin 45. The cam 44 is slidably mounted in a xed guide 46 and is arranged to move with the stem 27, being connected with a horizontal arm 48 mounted on said stem. 'llhe compensating mechanism described produces agraduated action, so that the throttle of the draft producing mechanism has a finely graduated step by step movement, therebly preventing the full travel of the regu ating element with each sli ht variation in pressure.

The lever 38 referred to above also operates the pilot valve in cooperation with the lever 19 in a manner which will now be described. The lever 38 projects through two opposite openings of the several openings 49 in the lower part of the body portion 11. The lever is received between a pair of fixed straps 50, and is provided with a cross shaft 51 which is mounted on ball bearings in each of the straps as indicated. Below the lever 38 is the air pressure chamber 14, referred to above, the upper wall of which is formed by a diaphragm 52 which is suitably mounted between two cu -shaped Tie upper surface of the diaphragm is open to the atmosphere and is provided with the usual button 55 in which a knife edge member 56 is mounted. The knife edge member 56 engages with a suitable notch 57 in the lower side of the lever 38, so that pressure beneath the diaphragm 52 tends to -move the lever about t e pivotal point 51 against the pressure of weights 58 and 59 which will now be described. The diaphragm 52 forms the draft pressure sensitive element.

The weight 59 preferably consists of a plurality of metal disks which are carried on a carriage 60. The carriage consists of a pair of straps 61 which are hung on suitable rollers 62 adaptecl to run on the upper surface of the lever 38. It is attached to the piston stem 27 by means of a cord or tion within which the furnace may be efliciently operated. To illustrate this, we may suppose, for exam le, that the boiler pressure drops a su stantial amount below normal, owing to a sudden increase of load or the like. Under the circumstances, the re lating lever 19 will at once lower the p' ot valve member 29 and will open it wide if the pressure change is beyond the of variation of the compensatin mec anism. The main piston stem 27 W1 then be moved downwardly to open the throttle of the draft producing mechanism. When the piston stem 27 ism its downward position, the weight carriage 60 will be at the outer end of its path of movement onythe lever 38 and in a position to offer the maximum of resistance to the pressure beneath the diaphragm 52, which is, for example, four ounces. The draft pressure will be immediately increased to four ounces and the lever 38' will be raised to horizontal position. The ilot valve member 29 will thus be raised y the rod 37, floating link 35, red 34 and floating link 32 and brought to a neutral position. A further pressure caused by the draft producing mechanism will raise the lever 38 above the horizontal position and will lift the valve above its neutral position, thereby causing the piston 25 to move the stem 27 up and close down the throttle until the draft pressure is reduoed to the maximum limit for which the' device is set, namely, four ounces. In this way, the maximum pressure 1offour ounces is maintained until the boiler pressure is.

increased and arrives within the range of operation of the compensating mechanism, at which time the air draft ressure will be slowly reduced until the boiler pressure reaches its normal.

On the other hand, if the boiler pressure is suddenly increased by an amount which is greater than the range of variation of the compensating mechanism, the lever 19 will at once 0 en the pilot valve member 29 and move t e piston stem 27 to its upward position, thereby closing the draft mechanism to idling speedfi The draft roducing mechanism will remain at id 'ng speed until the boiler pressure is reduced to within therange of variation of the compensatingv mechanism. When this occurs, the draft pressure will be gradually increased under the influence of both diaphragms, so that the .proper draft pressure to hold the boiler pressure at normal is always maintained.

It will thus be seen that the boiler pressure sensitive element and draft pressure sensitive element act in conjunction with each other to produce the proper draft pressure to maintain the steam pressure at normal solong as theboiler pressure remains within the range of operation of the compensating mechanism; that if the boiler pressure exceeds normal pressure an amount which is greater than the range of operation of the compensating mechanism, the draft pressure is controlled entirely by the boiler pressure sensitive element, and is held at a minimum; and that if the boiler pressure drops below normal an amount which is greater than the range of operation of the compensating mechanism, the draft pressure is entirely controlled by the draft pressure sensitive element and is maintained at the maximum amount of draft pressure for which the device is set until the boiler pressure increases.

It will also be seen that the portion of the device which is responsive to the draft pressure can be made quite delicate in its operation, so as to be capable of use with very low pressures, such, for instance, as prevail in the draft passages of furnaces, notwithstanding the provision of compensat-ing mechanism, including the travelling weight 59, for steadying the apparatus and preventing violent operation of the mechanism controlled under sudden changes in pressure. Compensating mechanism of this type, as heretofore constructed, has been limited to use in connection with rela-. tively high pressures since, for its efficient operation, a considerable fixed minimum pressure is imposed upon the diaphragm 52 or equivalent pressure sensitive element by the travelling weight 59, its operating weight 58, and the mass of the relatively long lever arm 38. .In the present construction, however, this fixed minimum pressure may be counterbalanced to any desired degree by the counterweight 69,

thereby retaining all of the advantages of a compensating mechanism of this type, while rendering the apparatus responsive to pressures as low as may be desired.

What is claimed is:

l. The improved boiler pressure and draft control mechanism which consists of a fluid pressure motor for governing the furnace draft, a pressure sensitive element which is actuated by boiler pressure, a ressure sensitive element which is actuated y draft pressure, said elements being independent of each other, a single pilot valve for said motor, and means for operating said pilot valve by each of said pressure elements independently of each other and in conjunction with each other.

2. The improved boiler pressure and draft control mechanism which consists of a motor for governing the furnace draft, a pr re sensitive element actuated by boi effi' essure, a pressure sensitive elementactuated by draft pressure, independent elements actuated by each of said pressure sensitlve elements, a control device for said motor, and a floating connection connecting independentehmmmandzsfld contml which. melt off said pressure sem sitive elements may opem slid cont-w].

- device independently. of the other and in conjunction with each othen.

3 The improved boiler pressure and draft control,mchenism which consists of a meter for governing. the fmnace draft, a

, ure sensitive element which is actuated boiler, pressure; a pressure sensitive elew-hiehuisactuated by draft pressure, a! control device for said! motor, amenfler epenhtivelp com-meted with said controll demee apam off ntmembcns oneef which isroperatively connected withene'otf said pressure sensitive elements, and; the other oi which is-opcrativelyconnected iWitll the ethos. of said pressure sensitive elements, M28 link: eretivelyconnected with each ofisaidxme s and with said control device" 4a The improved 'beileripressure and draft control mechanism which consisted in fiilid mile motor for governing the mm In r-seneitive element which is on one side-to boiler-pressure, and on the other side to e-eounteractmgpressure,

: ansaeond. pressure sensitive element which is subjeetedoon to draft: pressure and on the'other sidetoacounteractmgpressume,

means operated by said motor for increasing or demaeingtheeolmteractin .pxressure on the secondi'pressure sensitive ement, a smleupilotvalve fiolr seidlmotor, and means oropelatingamid pilot valve by each of sand pnsauresensitive elementsimlependontly clffwh-othor and 'in conjunction with each will:

5 Thedhproved boiler presence and diait controlimehanilm which consists-oi a. motnr tom. caning-the furnace draft, a pressure sensi tize element whichissubjected onone sick-.430 boilerptremm and clr-the other side tewcouderntilg presume, a seeoai'pressum semifive issubjecteden "one side'to draft pressure and on: the-other sidetoaucou'nlerm'ting pressure, means cried-by said motor for increasing or creae'mgthe counteracting pressure on the seoundprescure sensitive element, a control dais for saidtmotor; amenrlner operatively connected withsaidicmtl'ol device, a irolf numbers om of which'aia operative gonnnecbi'iwitliione oirsaiddpmn aer annit'nc ehmntss auditlim othr whmh: is opentively connected other oifuidlplflsure sellitimeldmnlh; 7 a4 l'mb'flalifly connected with said control device opersfilg mm, mnzhat eacllsidinf each connection l ming ailelitfle connection with eaehs'oithe members connected with said preanre sensitive elements.

6. The improved boiler pressure and draft control mechanism which consists of a. motor for governing the furnace draft, a pressure sensitive eiemermiwliich s is: subjected om one side to boiler pressure and on the other side te ecommuting, pressure, assecomd pressure sensitimelelmmxwdnchie subjected on one sidhvtnsdraxit paeeeum malice. the other sidetoa coummntilg, are, meams'operated liysaid'f'metor'iunmcreasimgior decreasing; the counteractingpressure omsaid; second' mantionech essure'sem'rtive element; a couztwoh devicee. or nmtor'yw rod opera:- tivelycemrectedito thucumtrolydevice, a link p'imlly' connected" with: saidr rod, and a pair oi rods, mofwhich is operativehy connectcditwitln one: pressure sensitive element and? orthm of: which isrcrpelativeliy connected with the ohlmrrotf said pressure sensitive ebements, said lastmzentionedrodsbeing pivotally connected to said link atreachlside of=saad1 eemol' deviee rodl 7. In awhwice od tha. character described, and ins: ceriuimliiom with" a motor for govemiilg 'thc furnace. draft, a: centre device thereior, va: eseure sensitive element actuatei pressme, a" second: pressure sensitive element: actuated; by' draft pressme,compensating mechanism aeti n omthe desicpressure-sensitive element; an means including; connections between the compensatingrdevice and'thle control device whereby said; pressure sensitiveclements may operate said eontrcli device independently of each otherrand'in con-junction with each other;

8: In; e device-cf the-character described, and in combination withlwnrotom 'for goveming the furnace draft, :1: control device there fior, a.- pressure sensitive element responsive to draft pressure, a second pressure semitive elementuesponsive to another varying condition of apcartion' in the boiler, con sating mechanism acting on the the pressure sensitive element, and connections between the compensating device and the control fieviee, whereby said pressure sensitive elements may operate said control dcv'ice' indepandentl oieach other andlin-mmjlmntionwitlr eac other.

a Inaideviceof the character described, and in combination with a motor for gove the inmacedraft, a control device there a diaphh-agm sufljected to boiler pressure, a counteracting weight'andle-ver aetizg t-hereenga second diaphragm sub- 1 todralt presameg a counteracting ,cwem aetingthuccm; a fleidipmsaure motor 0 1 ontrol device saidi hsvingia'pisflm, wpilotvsive fluid pressure motor, a, conaeetiomh'etween the element of acid at valve and both thc'boile'r pressure neeklever-aud the dealt prensurebehmediievega'cempent movable longitudi'nwl lf of one of sai levers, and connections to the piston of said fluid pressure motor, whereby the position of the compensating weight on the said lever is varied by changes in posimotor operating said control device, said motor having a piston, a pilot valve for said fluid ressure motor and connectlons whereby said two diaphragms may act independently and also in conjunction with each other.

11. The improved boiler pressure and draft control mechanism which consists of a motor for governin the furnace draft, ressure sensitive e ements one of which is su jected to boiler pressure on one side and the other of which is subjected to draft pressure on one side, means for applying counteracting pressure to the side 0 eac of said pressure sensitive elements opposite to that on which the boiler or draft pressure acts, a single pilot valve for said motor, means for operating said pilot valve by either of said pressure sensitive elements, and means operated by said motor for varying the counteracting pressure on one of said pressure sensitive elements.

12. The improved boiler pressure and draft control mechanism which consists of a motor for governing the furnace draft, two ressure sensitive elements one of which is su bjected to boiler pressure on one side and the other of which is subjected to draft pressure on one side, means for applying counteracting pressure to the side of each of said pressure sensitive elements opposite to that on which the boiler or draft pressure acts, a single pilot valve for said'motor, means for operating said pilot device by either of said pressure sensitive elements, and means operated by said motor for varying the'counteracting pressure on the pressure sensitive elements which is subjected to draft pressure.

13. A pressure regulating mechanism comprising a pressure sensitive element subjected to a variable pressure, means for applying a variable counteracting pressure to said element, means controlled by said pressure applying means for controlling the pressure to be regulated, said controlli means being operatively connected wit said pressure applying means to vary said counteracting pressure, and counterbalancing means for said pressure applying means to adapt said mechanism for operation under low pressures.

14. A pressure regulating mechanism comprising a pressure sensitive element subjected to a variable pressure, a lever for apcomprising a pressure sensitive element subjected to a variable pressure, a lever oppos ing said element, a motor controlled by said lever, means operated by said motor for controlling the pressure to be regulated, a travellinfgLl weight on said lever at one side of the lcrum thereof, said weight being connected with and controlled by said motor, and a counterweight on said lever at the opposite side of its fulcrum.

16. A pressure regulating mechanism comprising a lever, a pressure sensitive element subjected to a. variable pressure and acting on said lever at one side of the fulcrum thereof to apply thereto a moment in one direction, means for applying to said lever a variable counteracting moment in the opposite direction, means for applying to said lever an additional moment in said first named direction, a motor controlled by said lever and operatively connected with said counteracting moment applying means to vary said counteracting moment, and means operated by said motor for controlling the pressure to be regulated.

17. A pressure regulating mechanism comprising a pressure sensitive element subjected to a variable pressure, a lever opposing said element, a motor controlled by said lever, means operated by said motor for controlling the premure to be regulated,v a travelling weight on said lever at one side of the fulcrum thereof, said Weight being connected with said motor and moved thereby in one direction, a. second Weight connected with said travelling weight for moving the same in the opposite direction, and a third Weight on said lever at the opposite side of its fulcrum.

In testimony whereof I affix my signature.

FANNIE O. MELCHER, E meant-rim of the will of George S. Melcller,

deceased. 

